Influence of Offset Distance of Hole on Explosive Crack Propagation of Polymethyl Methacrylate Plate by Caustics Method
Source abstract
Abstract
Holes have an important influence on dynamic fracture process of brittle materials. In this paper, the influence of the hole offset distance (HOD) on the movement process of the explosive crack is studied. Polymethyl methacrylate (PMMA) is used as the experimental material, and different HOD holes are drilled on the PMMA plate. A new digital laser dynamic caustics system is employed to observe the crack tip dynamic stress intensity factor and crack growth velocity of PMMA plates with different HODs under explosive loading. The results indicate that holes reduce the peak velocity of explosive crack propagation. Moreover, the interaction between the stress wave reflected by the hole and the explosion stress wave is the main cause of crack deflection. Lastly, as the HOD increases, the crack motion trajectory is weakened by the interference of the holes, which gradually decreases corresponding stress intensity factors. With the increase of HOD/d, the crack arrest effect of empty hole decreases gradually.
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Research context
OpenAlex topics: Ultrasonics and Acoustic Wave Propagation · Structural Response to Dynamic Loads · High-Velocity Impact and Material Behavior
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